Abstract
FSO communication systems links is vulnerable due to degrading effects of atmospheric turbulence and point errors. We investigate the error rate performance of Free-Space Optical (FSO) links over gamma-gamma turbulence fading channels in the presence of pointing error. Assuming Intensity-Modulation/Direct Detection (IM/DD) with On-Off Keying (OOK), a novel closed-form expression for BER of FSO is derived. Another work is a study of how the BER are affected by the atmospheric turbulence and other parameters such as the normalized beamwidth, the average transmitted optical power, the normalized jitter. Numerical examples are further provided to verify the derived analytical expressions. The results show that optimizing the beamwidth can achieve the minimum BER for a given average transmitted optical power.
Highlights
Free Space Optical communication (FSO) has received considerable attention recently as attractive solution for high–rate last–mile terrestrial communications due to its large bandwidth, unregulated spectrum, low cost, ease of redeployment
The performance of FSO communication systems is susceptible to atmospheric turbulence and point errors
Many statistical models for the intensity fluctuation through FSO channels have been proposed such as the log-normal distribution, K distribution, exponential distribution, IK distribution, gamma-gamma distribution mode
Summary
Free Space Optical communication (FSO) has received considerable attention recently as attractive solution for high–rate last–mile terrestrial communications due to its large bandwidth, unregulated spectrum, low cost, ease of redeployment. Nistazakis et al (2009) have studied the FSO performance in terms of average capacity and outage probability over gamma-gamma atmospheric turbulence channels. Farid and Hranilovic (2007) consider a FSO channel model affected by misalignment fading (pointing error) effects They have considered log-normal distributed and a closed-form expression for the outage probability is presented. In Sandalidis (2008), BER performances of FSO links over K distribution atmospheric turbulence channels with pointing errors have been investigated. Chao et al (2010) has analysised average capacity of FSO Links over gamma-gamma distribution atmospheric turbulence channels with pointing errors. We have investigated BER performance of FSO links over gamma-gamma atmospheric turbulence channels in the presence of pointing errors using OOK formats, which is widely used in commercial systems.
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